const path = require('path');
const pkg = require('./package.json');
function resolve(dir) {
    return path.join(__dirname, dir)
}

const port = process.env.PORT || process.env.npm_config_port || 8080 // dev port

module.exports = {
    publicPath: './',
    assetsDir: 'static',
    productionSourceMap: false,
    devServer: {
        port: port,
        open: false,
        overlay: {
            warnings: false,
            errors: true
        },
        proxy: {
            [process.env.VUE_APP_BASE_API]:{
                target: process.env.VUE_APP_BASE_API_TARGET,
                changeOrigin:true,
                pathRewrite:{
                    ['^' + process.env.VUE_APP_BASE_API]: process.env.VUE_APP_BASE_API // 重写接口
                }
            }
        }
    },
    configureWebpack: {
        // provide the app's title in webpack's name field, so that
        // it can be accessed in index.html to inject the correct title.
        name: pkg.name,
        resolve: {
            alias: {
                '@': resolve('src')
            }
        }
    },
    // alias 配置
    chainWebpack: (config) => {
        // set svg-sprite-loader, 第一步：让其他svg loader不要进行操作, 第二步：使用svg-sprite-loader 对 svg进行操作
        config.module
            .rule("svg")
            .exclude.add(resolve("src/icons/svg"))
            .end();
        config.module
            .rule("icons")
            .test(/\.svg$/)
            .include.add(resolve("src/icons/svg"))
            .end()
            .use("svg-sprite-loader")
            .loader("svg-sprite-loader")
            //定义规则 使用时 <svg class="icon"> <use xlink:href="#svg文件名"></use>  </svg>
            .options({
                symbolId: "[name]"
            })
            .end();

        // set preserveWhitespace
        config.module
            .rule('vue')
            .use('vue-loader')
            .loader('vue-loader')
            .tap(options => {
                options.compilerOptions.preserveWhitespace = true
                return options
            })
            .end();

        config
            // https://webpack.js.org/configuration/devtool/#development
            .when(process.env.NODE_ENV === 'development',
                config => config.devtool('cheap-source-map')
            );

        config
            .when(process.env.NODE_ENV !== 'development',
                config => {
                    config
                        .plugin('ScriptExtHtmlWebpackPlugin')
                        .after('html')
                        .use('script-ext-html-webpack-plugin', [{
                            // `runtime` must same as runtimeChunk name. default is `runtime`
                            inline: /runtime\..*\.js$/
                        }])
                        .end()
                    config
                        .optimization.splitChunks({
                        chunks: 'all',
                        cacheGroups: {
                            libs: {
                                name: 'chunk-libs',
                                test: /[\\/]node_modules[\\/]/,
                                priority: 10,
                                chunks: 'initial' // only package third parties that are initially dependent
                            },
                            elementUI: {
                                name: 'chunk-elementUI', // split elementUI into a single package
                                priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                                test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
                            },
                            commons: {
                                name: 'chunk-commons',
                                test: resolve('src/components'), // can customize your rules
                                minChunks: 3, //  minimum common number
                                priority: 5,
                                reuseExistingChunk: true
                            }
                        }
                    })
                    config.optimization.runtimeChunk('single')
                }
            )
    }
}
